Things You'll Need
Instructions
Download the program "MAME4ALL v4.9r2 Hires" to your Windows PC from TTYMan's personal website. TTYMan is the creator of the software. Unzip the file.
Connect your PSP Slim to your PC via the PSP USB cable.
Navigate to the PSP on your PC, found in "My Computer." Open the "PSP" folder, then click on the "GAME150" folder.
Copy the unzipped "MAME4ALL v4.9r2 Hires" file to the GAME150 folder.
Disconnect the PSP. Go to the PSP menu and navigate to "Game." Press the "X" button.
Find MAME and press the "X" button. MAME will install and be ready to use.